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You will have to go to each of the 26 pages that use this updated and approved template, and manually approve each landing page one by one.
It is an explicit action to avoid unintended changes being live by accidental / unintended changes in the template.
Hope this helps
A template change affects all children, so you have to do what Rajesh suggests otherwise the change is still in Draft mode.
If this was the only change you made, it should be ok. Be careful when changing LP Templates because it could break other code on the child page.
Once you approve the template, it will create drafts of all pages using that template. You need to go approve those individual landing page assets in order to get them to reflect the changes. You can either go through one-by-one as Rajesh said, or you can go to Design Studio > Landing Pages, filter/sort the view by all pages using that updated template, and then do a bulk approval. You can multi-select pages in this view and then click "Landing Page Actions > Approve Draft"